class User:
    def __init__(self,first_name,last_name):
        self.first_name = first_name
        self.last_name = last_name

    def describe_user(self):
        print(f'fist_name:{self.first_name} , last_name:{self.last_name}')

    def greet_user(self):
        print(f'Hello! Good to see you , {self.first_name}{self.last_name}!')

class Admin(User) :
    def __init__(self,first_name,last_name):
        super().__init__(first_name,last_name)
        self.privileges = Privileges()
    def show_privileges(self):
        self.privileges.show_privileges()

class Privileges(User):
    def __init__(self):
        self.privileges = ['can delete post','can add post','can ban user']
    def show_privileges(self):
        print(f'The admin\'s privileges are:')
        print(self.privileges)